Originally Posted by TZB283
Our 369bl is brand new and the black tank flush doesn’t work. I keep reading that the vacuum part under bathroom sink is probably backwards. We have switched it and it still doesn’t work. Any ideas?
If it's brand new, you need to contact your dealer. You don't want to do anything to void your warranty. In case you don't know, you need to have the black tank valve 'open' when you use the flush.
A black tank flush is something you can live without, at least temporarily. Just make certain you've got the tank at least 2/3 full and fill it up again a second time occasionally when you dump.